77 horsepower is 57.41889011 kW. The exact arithmetic is 77 × 0.7456998716 = 57.4188901118 kilowatts, using the defined factor rather than a rounded one, so this matches what a calibrated instrument would give you.
57.4189 kW is 77 mechanical horsepower and 78.07 metric PS. Put that through a 1,400 kg car at 80% drivetrain efficiency and the energy needed to reach 100 km/h — 540.1 kJ — takes about 11.8 seconds to deliver, which is a floor rather than a real figure because it ignores drag and traction limits.
The result sits 2.419 kW past 55 kW, so if you need a round figure to quote, 55 kW is the honest nearest one. Plenty of people do this in their head: divide by 1.3 instead of using the exact factor 0.7456998716. At 77 that shortcut gives 59.230769 kilowatts, off by 1.812 kilowatts or about 3.16%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
The formula
77 hp- The quantity being converted
0.7456998716- Exact kilowatts in one horsepower
57.41889011 kW- The converted result
How it works, step by step
- Begin from the figure you have: 77 horsepower.
- Multiply by 0.7456998716, the exact number of kilowatts in one horsepower.
- Result: 57.4188901118 kilowatts.
- Going the other way, divide rather than multiply — 57.41889011 kW ÷ 0.7456998716 brings you back to 77 hp.
Worked examples
The conversion itself
Because this is a straight proportion, 77 hp × 0.7456998716 = 57.4188901118 kW — no offset, no second term, nothing else to account for.
Verifying the result
57.41889011 kW ÷ 0.7456998716 = 77 hp. Recovering the original number is the fastest way to confirm the factor was not applied upside down.
How to read your score
Frequently asked questions
What is 77 horsepower in kilowatts?
It comes to 57.41889011 kW. The unrounded figure is 57.4188901118 kilowatts, if you need to carry it forward.
How do you convert horsepower to kilowatts?
Multiply by 0.7456998716. So 77 × 0.7456998716 = 57.41889011 kilowatts. The factor comes from a definition rather than a measurement, so it never changes.
What is 57.41889011 kilowatts back in horsepower?
Divide by 0.7456998716, or multiply by 1.34102209 — either returns 77 horsepower.
What does 77 hp actually look like?
57.4189 kW is 77 mechanical horsepower and 78.07 metric PS. Put that through a 1,400 kg car at 80% drivetrain efficiency and the energy needed to reach 100 km/h — 540.1 kJ — takes about 11.8 seconds to deliver, which is a floor rather than a real figure because it ignores drag and traction limits. Compare it against the surrounding values in the table below.
What is a horsepower?
Mechanical horsepower, defined by James Watt as 550 foot-pounds per second.
What is a kilowatt?
The rating unit for motors, EV chargers and solar arrays.
77 hp in kilowatts — nearby values
| Horsepower | Kilowatts | Unrounded |
|---|---|---|
| 71 hp | 52.944691 | 52.94469088 |
| 72 hp | 53.690391 | 53.69039075 |
| 73 hp | 54.436091 | 54.43609063 |
| 74 hp | 55.18179 | 55.1817905 |
| 75 hp | 55.92749 | 55.92749037 |
| 76 hp | 56.67319 | 56.67319024 |
| 77 hp | 57.41889 | 57.41889011 |
| 78 hp | 58.16459 | 58.16458998 |
| 79 hp | 58.91029 | 58.91028985 |
| 80 hp | 59.65599 | 59.65598973 |
| 81 hp | 60.40169 | 60.4016896 |
| 82 hp | 61.147389 | 61.14738947 |
| 83 hp | 61.893089 | 61.89308934 |
Exact factor: 1 horsepower = 0.745699871582 kilowatts. The row for 77 hp is the value this page is about.